public:

explicit Async(eventx::ThreadPool *thread_pool);

public:

using Callback = std::function<void(int)>;

using StringCallback = std::function<void(int, std::string &)>;

using StringVecCallback = std::function<void(int, std::vector<std::string> &)>;

void readFile(const std::string &filename, StringCallback &&cb);

void readFileLines(const std::string &filename, StringVecCallback &&cb);

void writeFile (const std::string &filename, const std::string &context, bool sync_now = false, Callback &&cb = nullptr);

void appendFile(const std::string &filename, const std::string &context, bool sync_now = false, Callback &&cb = nullptr);

void removeFile(const std::string &filename, Callback &&cb = nullptr);

void executeCmd(const std::string &cmd, Callback &&cb = nullptr);

void executeCmd(const std::string &cmd, StringCallback &&cb);

private:

eventx::ThreadPool *thread_pool_;